2 * fetchmail.c -- main driver module for fetchmail
4 * For license terms, see the file COPYING in this directory.
10 #if defined(STDC_HEADERS)
13 #if defined(HAVE_UNISTD_H)
16 #if defined(HAVE_ALLOCA_H)
25 #if defined(HAVE_SYSLOG)
31 #include <sys/types.h>
33 #ifdef HAVE_SYS_WAIT_H
37 #ifdef HAVE_GETHOSTBYNAME
39 #endif /* HAVE_GETHOSTBYNAME */
41 #include "fetchmail.h"
48 #define ENETUNREACH 128 /* Interactive doesn't know this */
49 #endif /* ENETUNREACH */
51 /* prototypes for internal functions */
52 static int load_params(int, char **, int);
53 static void dump_params (struct runctl *runp, struct query *, flag implicit);
54 static int query_host(struct query *);
56 /* controls the detail level of status/progress messages written to stderr */
57 int outlevel; /* see the O_.* constants above */
59 /* miscellaneous global controls */
60 struct runctl run; /* global controls for this run */
61 flag nodetach; /* if TRUE, don't detach daemon process */
62 flag quitmode; /* if --quit was set */
63 flag check_only; /* if --probe was set */
64 flag versioninfo; /* emit only version info */
65 char *user; /* the name of the invoking user */
66 char *home; /* invoking user's home directory */
67 char *fetchmailhost; /* the name of the host running fetchmail */
68 char *program_name; /* the name to prefix error messages with */
69 flag configdump; /* dump control blocks for configurator */
74 #endif /* NET_SECURITY */
76 static char *lockfile; /* name of lockfile */
77 static int querystatus; /* status of query */
78 static int successes; /* count number of successful polls */
79 static int lastsig; /* last signal received */
80 static struct runctl cmd_run; /* global options set from command line */
82 static void termhook(); /* forward declaration of exit hook */
85 * The function of this variable is to reduce the size of the window during
86 * which two SIGALRMS in rapid succession can hose the code. This is a
87 * bit of a kluge; the real right thing would use sigprocmask(), sigsuspend()
88 * and close the window entirely. But since the interval isn't normally
89 * going to be less than one second this is not a big issue.
91 #if defined(STDC_HEADERS)
92 static sig_atomic_t alarm_latch = FALSE;
94 /* assume int can be written in one atomic operation on non ANSI-C systems */
95 static int alarm_latch = FALSE;
98 RETSIGTYPE donothing(sig) int sig; {signal(sig, donothing); lastsig = sig;}
99 RETSIGTYPE gotsigalrm(sig) int sig; {signal(sig, donothing); lastsig = sig; alarm_latch = TRUE;}
102 static void unlockit(int n, void *p)
104 static void unlockit(void)
106 /* must-do actions for exit (but we can't count on being able to do malloc) */
112 /* Various EMX-specific definitions */
114 void itimerthread(void* dummy) {
115 if (outlevel == O_VERBOSE)
116 fprintf(stderr, "fetchmail: thread sleeping for %d sec.\n", poll_interval);
118 _sleep2(poll_interval*1000);
119 kill((getpid()), SIGALRM);
124 int main (int argc, char **argv)
126 int st, bkgd = FALSE;
127 int parsestatus, implicitmode = FALSE;
130 netrc_entry *netrc_list;
131 char *netrc_file, *tmpbuf;
134 envquery(argc, argv);
136 #define IDFILE_NAME ".fetchids"
137 run.idfile = (char *) xmalloc(strlen(home)+strlen(IDFILE_NAME)+2);
138 strcpy(run.idfile, home);
139 strcat(run.idfile, "/");
140 strcat(run.idfile, IDFILE_NAME);
144 if ((parsestatus = parsecmdline(argc,argv, &cmd_run, &cmd_opts)) < 0)
147 /* this hint to stdio should help messages come out in the right order */
148 setvbuf(stdout, NULL, _IOLBF, MSGBUFSIZE);
152 printf("This is fetchmail release %s", RELEASE_ID);
155 #endif /* POP2_ENABLE */
158 #endif /* POP3_ENABLE */
161 #endif /* IMAP_ENABLE */
164 #endif /* RPA_ENABLE */
167 #endif /* ETRN_ENABLE */
176 #endif /* NET_SECURITY */
179 /* this is an attempt to help remote debugging */
183 /* avoid parsing the config file if all we're doing is killing a daemon */
184 if (!(quitmode && argc == 2))
185 implicitmode = load_params(argc, argv, optind);
187 /* set up to do lock protocol */
188 #define FETCHMAIL_PIDFILE "fetchmail.pid"
189 tmpbuf = xmalloc(strlen(home) + strlen(FETCHMAIL_PIDFILE) + 3);
191 sprintf(tmpbuf, "%s/%s", PID_DIR, FETCHMAIL_PIDFILE);
193 strcpy(tmpbuf, home);
194 strcat(tmpbuf, "/.");
195 strcat(tmpbuf, FETCHMAIL_PIDFILE);
197 #undef FETCHMAIL_PIDFILE
199 /* perhaps we just want to check options? */
202 printf("Taking options from command line");
203 if (access(rcfile, 0))
206 printf(" and %s\n", rcfile);
207 if (outlevel == O_VERBOSE)
208 printf("Lockfile at %s\n", tmpbuf);
210 if (querylist == NULL)
211 (void) fprintf(stderr,
212 "No mailservers set up -- perhaps %s is missing?\n", rcfile);
214 dump_params(&run, querylist, implicitmode);
218 /* dump options as a Python dictionary, for configurator use */
221 dump_config(&run, querylist);
225 /* check for another fetchmail running concurrently */
227 if ((lockfile = (char *) malloc(strlen(tmpbuf) + 1)) == NULL)
229 fprintf(stderr,"fetchmail: cannot allocate memory for lock name.\n");
233 (void) strcpy(lockfile, tmpbuf);
234 if ((lockfp = fopen(lockfile, "r")) != NULL )
236 bkgd = (fscanf(lockfp,"%d %d", &pid, &st) == 2);
238 if (kill(pid, 0) == -1) {
239 fprintf(stderr,"fetchmail: removing stale lockfile\n");
247 /* if no mail servers listed and nothing in background, we're done */
248 if (!(quitmode && argc == 2) && pid == -1 && querylist == NULL) {
249 (void)fputs("fetchmail: no mailservers have been specified.\n",stderr);
253 /* perhaps user asked us to kill the other fetchmail */
258 fprintf(stderr,"fetchmail: no other fetchmail is running\n");
262 else if (kill(pid, SIGTERM) < 0)
264 fprintf(stderr,"fetchmail: error killing %s fetchmail at %d; bailing out.\n",
265 bkgd ? "background" : "foreground", pid);
270 fprintf(stderr,"fetchmail: %s fetchmail at %d killed.\n",
271 bkgd ? "background" : "foreground", pid);
280 /* another fetchmail is running -- wake it up or die */
286 "fetchmail: can't check mail while another fetchmail to same host is running.\n");
289 else if (!implicitmode)
292 "fetchmail: can't poll specified hosts with another fetchmail running at %d.\n",
299 "fetchmail: another foreground fetchmail is running at %d.\n",
306 "fetchmail: can't accept options while a background fetchmail is running.\n");
309 else if (kill(pid, SIGUSR1) == 0)
312 "fetchmail: background fetchmail at %d awakened.\n",
319 * Should never happen -- possible only if a background fetchmail
320 * croaks after the first kill probe above but before the
321 * SIGUSR1/SIGHUP transmission.
324 "fetchmail: elder sibling at %d died mysteriously.\n",
326 return(PS_UNDEFINED);
330 /* parse the ~/.netrc file (if present) for future password lookups. */
331 netrc_file = (char *) xmalloc (strlen (home) + 8);
332 strcpy (netrc_file, home);
333 strcat (netrc_file, "/.netrc");
334 netrc_list = parse_netrc(netrc_file);
336 /* pick up interactively any passwords we need but don't have */
337 for (ctl = querylist; ctl; ctl = ctl->next)
338 if (ctl->active && !(implicitmode && ctl->server.skip)&&!ctl->password)
340 if (ctl->server.preauthenticate == A_KERBEROS_V4 ||
341 ctl->server.preauthenticate == A_KERBEROS_V5 ||
343 ctl->server.protocol == P_IMAP_GSS ||
345 ctl->server.protocol == P_IMAP_K4)
346 /* Server won't care what the password is, but there
347 must be some non-null string here. */
348 ctl->password = ctl->remotename;
351 /* look up the host and account in the .netrc file. */
352 netrc_entry *p = search_netrc(netrc_list,ctl->server.pollname);
353 while (p && strcmp(p->account, ctl->remotename))
354 p = search_netrc(p->next, ctl->remotename);
356 /* if we find a matching entry with a password, use it */
357 if (p && p->password)
358 ctl->password = xstrdup(p->password);
361 if (ctl->server.protocol != P_ETRN && ctl->server.protocol != P_IMAP_K4
363 && ctl->server.protocol != P_IMAP_GSS
368 #define PASSWORD_PROMPT "Enter password for %s@%s: "
369 tmpbuf = xmalloc(strlen(PASSWORD_PROMPT) +
370 strlen(ctl->remotename) +
371 strlen(ctl->server.pollname) + 1);
372 (void) sprintf(tmpbuf, PASSWORD_PROMPT,
373 ctl->remotename, ctl->server.pollname);
374 ctl->password = xstrdup((char *)getpassword(tmpbuf));
375 #undef PASSWORD_PROMPT
379 /* we don't need tmpbuf anymore */
381 tmpbuf = NULL; /* firewall code */
384 * Maybe time to go to demon mode...
386 #if defined(HAVE_SYSLOG)
389 openlog(program_name, LOG_PID, LOG_MAIL);
394 error_init(run.poll_interval == 0 && !run.logfile);
396 if (run.poll_interval)
399 daemonize(run.logfile, termhook);
400 error( 0, 0, "starting fetchmail %s daemon ", RELEASE_ID);
403 * We'll set up a handler for these when we're sleeping,
404 * but ignore them otherwise so as not to interrupt a poll.
406 signal(SIGUSR1, SIG_IGN);
407 if (run.poll_interval && !getuid())
408 signal(SIGHUP, SIG_IGN);
411 /* beyond here we don't want more than one fetchmail running per user */
413 signal(SIGABRT, termhook);
414 signal(SIGINT, termhook);
415 signal(SIGTERM, termhook);
416 signal(SIGALRM, termhook);
417 signal(SIGPIPE, termhook);
418 signal(SIGQUIT, termhook);
420 /* here's the exclusion lock */
421 if ((lockfp = fopen(lockfile,"w")) != NULL) {
422 fprintf(lockfp,"%d",getpid());
423 if (run.poll_interval)
424 fprintf(lockfp," %d", run.poll_interval);
431 on_exit(unlockit, (char *)NULL);
436 * Query all hosts. If there's only one, the error return will
437 * reflect the status of that transaction.
440 #if defined(HAVE_RES_SEARCH) && defined(USE_TCPIP_FOR_DNS)
442 * This was an efficiency hack that backfired. The theory
443 * was that using TCP/IP for DNS queries would get us better
444 * reliability and shave off some per-UDP-packet costs.
445 * Unfortunately it interacted badly with diald, which effectively
446 * filters out DNS queries over TCP/IP for reasons having to do
447 * with some obscure kernel problem involving bootstrapping of
448 * dynamically-addressed links. I don't understand this mess
449 * and don't want to, so it's "See ya!" to this hack.
451 sethostent(TRUE); /* use TCP/IP for mailserver queries */
452 #endif /* HAVE_RES_SEARCH */
455 for (ctl = querylist; ctl; ctl = ctl->next)
457 if (ctl->active && !(implicitmode && ctl->server.skip))
459 /* check skip interval first so that it counts all polls */
460 if (run.poll_interval && ctl->server.interval)
462 if (ctl->server.poll_count++ % ctl->server.interval)
464 if (outlevel == O_VERBOSE)
466 "fetchmail: interval not reached, not querying %s\n",
467 ctl->server.pollname);
472 #if defined(linux) && !INET6
473 /* interface_approve() does its own error logging */
474 if (!interface_approve(&ctl->server))
476 #endif /* defined(linux) && !INET6 */
478 #ifdef HAVE_GETHOSTBYNAME
480 * This functions partly as a probe to make sure our
481 * nameserver is still up. The multidrop case
482 * (especially) needs it.
484 if (ctl->server.preauthenticate==A_KERBEROS_V4 ||
485 ctl->server.preauthenticate==A_KERBEROS_V5 ||
488 struct hostent *namerec;
490 /* compute the canonical name of the host */
492 namerec = gethostbyname(ctl->server.queryname);
493 if (namerec == (struct hostent *)NULL)
496 "skipping %s poll, ",
497 ctl->server.pollname);
500 if (errno == ENETUNREACH)
501 break; /* go to sleep */
503 #ifdef HAVE_HERROR /* NEXTSTEP doesn't */
506 #endif /* HAVE_HERROR */
511 free(ctl->server.truename);
512 ctl->server.truename=xstrdup((char *)namerec->h_name);
515 #endif /* HAVE_GETHOSTBYNAME */
517 querystatus = query_host(ctl);
519 if (querystatus == PS_SUCCESS)
524 update_str_lists(ctl);
526 /* Save UID list to prevent re-fetch in case fetchmail
527 recover from crash */
528 if (!check_only && outlevel == O_VERBOSE)
530 write_saved_lists(querylist, run.idfile);
531 error(0, 0, "fetchmail: saved UID List");
533 #endif /* POP3_ENABLE */
535 else if (!check_only &&
536 ((querystatus!=PS_NOMAIL) || (outlevel==O_VERBOSE)))
537 error(0, 0, "Query status=%d", querystatus);
539 #if defined(linux) && !INET6
540 if (ctl->server.monitor)
542 /* Allow some time for the link to quiesce. One
543 * second is usually sufficient, three is safe.
544 * Note: this delay is important - don't remove!
547 interface_note_activity(&ctl->server);
549 #endif /* defined(linux) && !INET6 */
553 #if defined(HAVE_RES_SEARCH) && defined(USE_TCPIP_FOR_DNS)
554 endhostent(); /* release TCP/IP connection to nameserver */
555 #endif /* HAVE_RES_SEARCH */
558 * Close all SMTP delivery sockets. For optimum performance
559 * we'd like to hold them open til end of run, but (1) this
560 * loses if our poll interval is longer than the MTA's inactivity
561 * timeout, and (2) some MTAs (like smail) don't deliver after
562 * each message, but rather queue up mail and wait to actually
563 * deliver it until the input socket is closed.
565 for (ctl = querylist; ctl; ctl = ctl->next)
566 if (ctl->smtp_socket != -1)
568 SMTP_quit(ctl->smtp_socket);
569 close(ctl->smtp_socket);
570 ctl->smtp_socket = -1;
574 * OK, we've polled. Now sleep.
576 if (run.poll_interval)
578 if (outlevel == O_VERBOSE)
583 fprintf(stderr, "fetchmail: sleeping at %s", ctime(&now));
587 * With this simple hack, we make it possible for a foreground
588 * fetchmail to wake up one in daemon mode. What we want is the
589 * side effect of interrupting any sleep that may be going on,
590 * forcing fetchmail to re-poll its hosts. The second line is
591 * for people who think all system daemons wake up on SIGHUP.
593 signal(SIGUSR1, donothing);
595 signal(SIGHUP, donothing);
598 * We can't use sleep(3) here because we need an alarm(3)
599 * equivalent in order to implement server nonresponse timeout.
600 * We'll just assume setitimer(2) is available since fetchmail
601 * has to have a BSDoid socket layer to work at all.
605 #ifdef SLEEP_WITH_ALARM /* not normally on */
607 * This code stopped working under glibc-2, apparently due
608 * to the change in signal(2) semantics. (The siginterrupt
609 * line, added later, should fix this problem.) John Stracke
610 * <francis@netscape.com> wrote:
612 * The problem seems to be that, after hitting the interval
613 * timer while talking to the server, the process no longer
614 * responds to SIGALRM. I put in printf()s to see when it
615 * reached the pause() for the poll interval, and I checked
616 * the return from setitimer(), and everything seemed to be
617 * working fine, except that the pause() just ignored SIGALRM.
618 * I thought maybe the itimer wasn't being fired, so I hit
619 * it with a SIGALRM from the command line, and it ignored
620 * that, too. SIGUSR1 woke it up just fine, and it proceeded
621 * to repoll--but, when the dummy server didn't respond, it
622 * never timed out, and SIGALRM wouldn't make it.
624 * (continued below...)
626 struct itimerval ntimeout;
628 ntimeout.it_interval.tv_sec = ntimeout.it_interval.tv_usec = 0;
629 ntimeout.it_value.tv_sec = poll_interval;
630 ntimeout.it_value.tv_usec = 0;
632 siginterrupt(SIGALRM, 1);
634 signal(SIGALRM, gotsigalrm); /* first trap signals */
635 setitimer(ITIMER_REAL,&ntimeout,NULL); /* then start timer */
636 /* there is a very small window between the next two lines */
639 signal(SIGALRM, SIG_IGN);
642 * So the workaround I used is to make it sleep by using
643 * select() instead of setitimer()/pause(). select() is
644 * perfectly happy being called with a timeout and
645 * no file descriptors; it just sleeps until it hits the
646 * timeout. The only concern I had was that it might
647 * implement its timeout with SIGALRM--there are some
648 * Unices where this is done, because select() is a library
649 * function--but apparently not.
651 struct timeval timeout;
653 timeout.tv_sec = run.poll_interval;
656 select(0,0,0,0, &timeout);
660 signal(SIGALRM, gotsigalrm);
661 _beginthread(itimerthread, NULL, 32768, NULL);
662 /* see similar code above */
665 signal(SIGALRM, SIG_IGN);
667 if (lastsig == SIGUSR1
668 || ((run.poll_interval && !getuid()) && lastsig == SIGHUP))
670 #ifdef SYS_SIGLIST_DECLARED
671 error(0, 0, "awakened by %s", sys_siglist[lastsig]);
673 error(0, 0, "awakened by signal %d", lastsig);
678 /* now lock out interrupts again */
679 signal(SIGUSR1, SIG_IGN);
681 signal(SIGHUP, SIG_IGN);
683 if (outlevel == O_VERBOSE)
688 fprintf(stderr, "fetchmail: awakened at %s", ctime(&now));
694 if (outlevel == O_VERBOSE)
695 fprintf(stderr,"fetchmail: normal termination, status %d\n",
696 successes ? PS_SUCCESS : querystatus);
699 exit(successes ? PS_SUCCESS : querystatus);
702 static void optmerge(struct query *h2, struct query *h1, int force)
703 /* merge two options records */
706 * If force is off, modify h2 fields only when they're empty (treat h1
707 * as defaults). If force is on, modify each h2 field whenever h1
708 * is nonempty (treat h1 as an override).
713 append_str_list(&h2->server.localdomains, &h1->server.localdomains);
714 append_str_list(&h2->localnames, &h1->localnames);
715 append_str_list(&h2->mailboxes, &h1->mailboxes);
716 append_str_list(&h2->smtphunt, &h1->smtphunt);
719 #define FLAG_MERGE(fld) if (force ? !!h1->fld : !h2->fld) h2->fld = h1->fld
720 FLAG_MERGE(server.via);
721 FLAG_MERGE(server.protocol);
723 FLAG_MERGE(server.service);
724 FLAG_MERGE(server.netsec);
726 FLAG_MERGE(server.port);
728 FLAG_MERGE(server.interval);
729 FLAG_MERGE(server.preauthenticate);
730 FLAG_MERGE(server.timeout);
731 FLAG_MERGE(server.envelope);
732 FLAG_MERGE(server.envskip);
733 FLAG_MERGE(server.qvirtual);
734 FLAG_MERGE(server.skip);
735 FLAG_MERGE(server.dns);
736 FLAG_MERGE(server.uidl);
739 FLAG_MERGE(server.interface);
740 FLAG_MERGE(server.monitor);
741 FLAG_MERGE(server.interface_pair);
744 FLAG_MERGE(remotename);
745 FLAG_MERGE(password);
747 FLAG_MERGE(smtpaddress);
748 FLAG_MERGE(antispam);
749 FLAG_MERGE(preconnect);
753 FLAG_MERGE(fetchall);
757 FLAG_MERGE(pass8bits);
758 FLAG_MERGE(dropstatus);
759 FLAG_MERGE(mimedecode);
761 FLAG_MERGE(fetchlimit);
762 FLAG_MERGE(batchlimit);
767 static int load_params(int argc, char **argv, int optind)
769 int implicitmode, st;
771 struct query def_opts, *ctl;
773 memset(&def_opts, '\0', sizeof(struct query));
774 def_opts.smtp_socket = -1;
775 def_opts.smtpaddress = (char *)0;
776 def_opts.antispam = 571;
778 def_opts.server.protocol = P_AUTO;
779 def_opts.server.timeout = CLIENT_TIMEOUT;
780 def_opts.remotename = user;
781 def_opts.expunge = 1;
783 /* this builds the host list */
784 if (prc_parse_file(rcfile, !versioninfo) != 0)
787 if ((implicitmode = (optind >= argc)))
789 for (ctl = querylist; ctl; ctl = ctl->next)
793 for (; optind < argc; optind++)
795 flag predeclared = FALSE;
798 * If hostname corresponds to a host known from the rc file,
799 * simply declare it active. Otherwise synthesize a host
800 * record from command line and defaults
802 for (ctl = querylist; ctl; ctl = ctl->next)
803 if (!strcmp(ctl->server.pollname, argv[optind])
804 || str_in_list(&ctl->server.akalist, argv[optind], TRUE))
813 * Allocate and link record without copying in
814 * command-line args; we'll do that with the optmerge
817 ctl = hostalloc((struct query *)NULL);
819 ctl->server.pollname = xstrdup(argv[optind]);
824 * If there's a defaults record, merge it and lose it.
826 if (querylist && strcmp(querylist->server.pollname, "defaults") == 0)
828 for (ctl = querylist->next; ctl; ctl = ctl->next)
829 optmerge(ctl, querylist, FALSE);
830 querylist = querylist->next;
833 /* don't allow a defaults record after the first */
834 for (ctl = querylist; ctl; ctl = ctl->next)
835 if (ctl != querylist && strcmp(ctl->server.pollname, "defaults") == 0)
838 /* merge in wired defaults, do sanity checks and prepare internal fields */
839 for (ctl = querylist; ctl; ctl = ctl->next)
841 if (configdump || (ctl->active && !(implicitmode && ctl->server.skip)))
843 /* merge in defaults */
844 optmerge(ctl, &def_opts, FALSE);
846 /* force command-line options */
847 optmerge(ctl, &cmd_opts, TRUE);
849 /* make sure we have a nonempty host list to forward to */
852 save_str(&ctl->smtphunt, fetchmailhost, FALSE);
853 /* for non ETRN try to deliver mails to localhost if
854 * fetchmailhost fails
856 if (ctl->server.protocol != P_ETRN) {
857 save_str(&ctl->smtphunt, "localhost", FALSE);
861 /* keep lusers from shooting themselves in the foot :-) */
862 if (run.poll_interval && ctl->limit)
864 fprintf(stderr,"fetchmail: you'd never see large messages!\n");
868 /* if `user' doesn't name a real local user, try to run as root */
869 if ((pw = getpwnam(user)) == (struct passwd *)NULL)
872 ctl->uid = pw->pw_uid; /* for local delivery via MDA */
873 if (!ctl->localnames) /* for local delivery via SMTP */
874 save_str_pair(&ctl->localnames, user, NULL);
876 /* this code enables flags to be turned off */
877 #define DEFAULT(flag, dflt) if (flag == FLAG_TRUE)\
879 else if (flag == FLAG_FALSE)\
883 DEFAULT(ctl->keep, FALSE);
884 DEFAULT(ctl->fetchall, FALSE);
885 DEFAULT(ctl->flush, FALSE);
886 DEFAULT(ctl->rewrite, TRUE);
887 DEFAULT(ctl->stripcr, (ctl->mda != (char *)NULL));
888 DEFAULT(ctl->forcecr, FALSE);
889 DEFAULT(ctl->pass8bits, FALSE);
890 DEFAULT(ctl->dropstatus, FALSE);
891 DEFAULT(ctl->mimedecode, FALSE);
892 DEFAULT(ctl->server.dns, TRUE);
893 DEFAULT(ctl->server.uidl, FALSE);
896 #if !defined(HAVE_GETHOSTBYNAME) || !defined(HAVE_RES_SEARCH)
897 /* can't handle multidrop mailboxes unless we can do DNS lookups */
898 if (ctl->localnames && ctl->localnames->next && ctl->server.dns)
900 ctl->server.dns = FALSE;
901 fprintf(stderr, "fetchmail: warning: no DNS available to check multidrop fetches from %s\n", ctl->server.pollname);
903 #endif /* !HAVE_GETHOSTBYNAME || !HAVE_RES_SEARCH */
907 * Compute the true name of the mailserver host.
908 * There are two clashing cases here:
910 * (1) The poll name is a label, possibly on one of several
911 * poll configurations for the same host. In this case
912 * the `via' option will be present and give the true name.
914 * (2) The poll name is the true one, the via name is
915 * localhost. This is going to be typical for ssh-using
918 * We're going to assume the via name is true unless it's
921 * Each poll cycle, if we've got DNS, we'll try to canonicalize
922 * the name. This will function as a probe to ensure the
923 * host's nameserver is up.
925 if (ctl->server.via && strcmp(ctl->server.via, "localhost"))
926 ctl->server.queryname = xstrdup(ctl->server.via);
928 ctl->server.queryname = xstrdup(ctl->server.pollname);
929 ctl->server.truename = xstrdup(ctl->server.queryname);
931 /* if no folders were specified, set up the null one as default */
933 save_str(&ctl->mailboxes, (char *)NULL, 0);
935 /* maybe user overrode timeout on command line? */
936 if (ctl->server.timeout == -1)
937 ctl->server.timeout = CLIENT_TIMEOUT;
941 if (ctl->server.port < 0)
943 (void) fprintf(stderr,
944 "%s configuration invalid, port number cannot be negative",
945 ctl->server.pollname);
948 if (ctl->server.protocol == P_RPOP && ctl->server.port >= 1024)
950 (void) fprintf(stderr,
951 "%s configuration invalid, RPOP requires a privileged port",
952 ctl->server.pollname);
959 /* here's where we override globals */
961 run.logfile = cmd_run.logfile;
963 run.idfile = cmd_run.idfile;
964 if (cmd_run.poll_interval >= 0)
965 run.poll_interval = cmd_run.poll_interval;
966 if (cmd_run.invisible)
967 run.invisible = cmd_run.invisible;
968 if (cmd_run.use_syslog)
969 run.use_syslog = cmd_run.use_syslog;
971 /* check and daemon options are not compatible */
972 if (check_only && run.poll_interval)
973 run.poll_interval = 0;
976 /* initialize UID handling */
977 if (!versioninfo && (st = prc_filecheck(run.idfile, !versioninfo)) != 0)
980 initialize_saved_lists(querylist, run.idfile);
981 #endif /* POP3_ENABLE */
983 return(implicitmode);
986 void termhook(int sig)
987 /* to be executed on normal or signal-induced termination */
992 * Sending SMTP QUIT on signal is theoretically nice, but led to a
993 * subtle bug. If fetchmail was terminated by signal while it was
994 * shipping message text, it would hang forever waiting for a
995 * command acknowledge. In theory we could enable the QUIT
996 * only outside of the message send. In practice, we don't
997 * care. All mailservers hang up on a dropped TCP/IP connection
1002 error(0, 0, "terminated with signal %d", sig);
1004 /* terminate all SMTP connections cleanly */
1005 for (ctl = querylist; ctl; ctl = ctl->next)
1006 if (ctl->smtp_socket != -1)
1007 SMTP_quit(ctl->smtp_socket);
1011 write_saved_lists(querylist, run.idfile);
1012 #endif /* POP3_ENABLE */
1015 * Craig Metz, the RFC1938 one-time-password guy, points out:
1016 * "Remember that most kernels don't zero pages before handing them to the
1017 * next process and many kernels share pages between user and kernel space.
1018 * You'd be very surprised what you can find from a short program to do a
1019 * malloc() and then dump the contents of the pages you got. By zeroing
1020 * the secrets at end of run (earlier if you can), you make sure the next
1021 * guy can't get the password/pass phrase."
1023 * Right you are, Craig!
1025 for (ctl = querylist; ctl; ctl = ctl->next)
1027 memset(ctl->password, '\0', strlen(ctl->password));
1029 #if !defined(HAVE_ATEXIT) && !defined(HAVE_ON_EXIT)
1033 exit(successes ? PS_SUCCESS : querystatus);
1037 * Sequence of protocols to try when autoprobing, most capable to least.
1039 static const int autoprobe[] =
1043 #endif /* IMAP_ENABLE */
1046 #endif /* POP3_ENABLE */
1049 #endif /* POP2_ENABLE */
1052 static int query_host(struct query *ctl)
1053 /* perform fetch transaction with single host */
1057 if (outlevel == O_VERBOSE)
1062 fprintf(stderr, "fetchmail: %s querying %s (protocol %s) at %s",
1064 ctl->server.pollname, showproto(ctl->server.protocol), ctime(&now));
1066 switch (ctl->server.protocol) {
1068 for (i = 0; i < sizeof(autoprobe)/sizeof(autoprobe[0]); i++)
1070 ctl->server.protocol = autoprobe[i];
1071 if ((st = query_host(ctl)) == PS_SUCCESS || st == PS_NOMAIL || st == PS_AUTHFAIL || st == PS_LOCKBUSY || st == PS_SMTP)
1074 ctl->server.protocol = P_AUTO;
1079 return(doPOP2(ctl));
1081 fprintf(stderr, "POP2 support is not configured.\n");
1082 return(PS_PROTOCOL);
1083 #endif /* POP2_ENABLE */
1089 return(doPOP3(ctl));
1091 fprintf(stderr, "POP3 support is not configured.\n");
1092 return(PS_PROTOCOL);
1093 #endif /* POP3_ENABLE */
1101 return(doIMAP(ctl));
1103 fprintf(stderr, "IMAP support is not configured.\n");
1104 return(PS_PROTOCOL);
1105 #endif /* IMAP_ENABLE */
1109 fprintf(stderr, "ETRN support is not configured.\n");
1110 return(PS_PROTOCOL);
1112 #ifdef HAVE_GETHOSTBYNAME
1113 return(doETRN(ctl));
1115 fprintf(stderr, "Cannot support ETRN without gethostbyname(2).\n");
1116 return(PS_PROTOCOL);
1117 #endif /* HAVE_GETHOSTBYNAME */
1118 #endif /* ETRN_ENABLE */
1120 error(0, 0, "unsupported protocol selected.");
1121 return(PS_PROTOCOL);
1125 void dump_params (struct runctl *runp, struct query *querylist, flag implicit)
1126 /* display query parameters in English */
1130 if (runp->poll_interval)
1131 printf("Poll interval is %d seconds\n", runp->poll_interval);
1133 printf("Logfile is %s\n", runp->logfile);
1134 if (strcmp(runp->idfile, IDFILE_NAME))
1135 printf("Idfile is %s\n", runp->idfile);
1136 #if defined(HAVE_SYSLOG)
1137 if (runp->use_syslog)
1138 printf("Progress messages will be logged via syslog\n");
1140 if (runp->invisible)
1141 printf("Fetchmail will masquerade and will not generate Received\n");
1143 for (ctl = querylist; ctl; ctl = ctl->next)
1145 if (!ctl->active || (implicit && ctl->server.skip))
1148 printf("Options for retrieving from %s@%s:\n",
1149 ctl->remotename, visbuf(ctl->server.pollname));
1151 if (ctl->server.via && (ctl->server.protocol != P_ETRN))
1152 printf(" Mail will be retrieved via %s\n", ctl->server.via);
1154 if (ctl->server.interval)
1155 printf(" Poll of this server will occur every %d intervals.\n",
1156 ctl->server.interval);
1157 if (ctl->server.truename)
1158 printf(" True name of server is %s.\n", ctl->server.truename);
1159 if (ctl->server.skip || outlevel == O_VERBOSE)
1160 printf(" This host will%s be queried when no host is specified.\n",
1161 ctl->server.skip ? " not" : "");
1162 /* don't poll for password when there is one or when using the ETRN
1164 if (!ctl->password && (ctl->server.protocol != P_ETRN))
1165 printf(" Password will be prompted for.\n");
1166 else if (outlevel == O_VERBOSE)
1167 if (ctl->server.protocol == P_APOP)
1168 printf(" APOP secret = '%s'.\n", visbuf(ctl->password));
1169 else if (ctl->server.protocol == P_RPOP)
1170 printf(" RPOP id = '%s'.\n", visbuf(ctl->password));
1172 printf(" Password = '%s'.\n", visbuf(ctl->password));
1173 if (ctl->server.protocol == P_POP3
1175 && !strcmp(ctl->server.service, KPOP_PORT)
1177 && ctl->server.port == KPOP_PORT
1179 && (ctl->server.preauthenticate == A_KERBEROS_V4 ||
1180 ctl->server.preauthenticate == A_KERBEROS_V5))
1181 printf(" Protocol is KPOP");
1183 printf(" Protocol is %s", showproto(ctl->server.protocol));
1185 if (ctl->server.service)
1186 printf(" (using service %s)", ctl->server.service);
1187 if (ctl->server.netsec)
1188 printf(" (using network security options %s)", ctl->server.netsec);
1190 if (ctl->server.port)
1191 printf(" (using port %d)", ctl->server.port);
1193 else if (outlevel == O_VERBOSE)
1194 printf(" (using default port)");
1195 if (ctl->server.uidl && (ctl->server.protocol != P_ETRN))
1196 printf(" (forcing UIDL use)");
1199 if (ctl->server.preauthenticate == A_KERBEROS_V4)
1200 printf(" Kerberos V4 preauthentication enabled.\n");
1201 if (ctl->server.preauthenticate == A_KERBEROS_V5)
1202 printf(" Kerberos V5 preauthentication enabled.\n");
1203 if (ctl->server.timeout > 0)
1204 printf(" Server nonresponse timeout is %d seconds", ctl->server.timeout);
1205 if (ctl->server.timeout == CLIENT_TIMEOUT)
1206 printf(" (default).\n");
1210 if (ctl->server.protocol != P_ETRN) {
1211 if (!ctl->mailboxes->id)
1212 printf(" Default mailbox selected.\n");
1217 printf(" Selected mailboxes are:");
1218 for (idp = ctl->mailboxes; idp; idp = idp->next)
1219 printf(" %s", idp->id);
1222 printf(" %s messages will be retrieved (--all %s).\n",
1223 ctl->fetchall ? "All" : "Only new",
1224 ctl->fetchall ? "on" : "off");
1225 printf(" Fetched messages will%s be kept on the server (--keep %s).\n",
1226 ctl->keep ? "" : " not",
1227 ctl->keep ? "on" : "off");
1228 printf(" Old messages will%s be flushed before message retrieval (--flush %s).\n",
1229 ctl->flush ? "" : " not",
1230 ctl->flush ? "on" : "off");
1231 printf(" Rewrite of server-local addresses is %sabled (--norewrite %s).\n",
1232 ctl->rewrite ? "en" : "dis",
1233 ctl->rewrite ? "off" : "on");
1234 printf(" Carriage-return stripping is %sabled (stripcr %s).\n",
1235 ctl->stripcr ? "en" : "dis",
1236 ctl->stripcr ? "on" : "off");
1237 printf(" Carriage-return forcing is %sabled (forcecr %s).\n",
1238 ctl->forcecr ? "en" : "dis",
1239 ctl->forcecr ? "on" : "off");
1240 printf(" Interpretation of Content-Transfer-Encoding is %sabled (pass8bits %s).\n",
1241 ctl->pass8bits ? "dis" : "en",
1242 ctl->pass8bits ? "on" : "off");
1243 printf(" MIME decoding is %sabled (mimedecode %s).\n",
1244 ctl->mimedecode ? "en" : "dis",
1245 ctl->mimedecode ? "on" : "off");
1246 printf(" Nonempty Status lines will be %s (dropstatus %s)\n",
1247 ctl->dropstatus ? "discarded" : "kept",
1248 ctl->dropstatus ? "on" : "off");
1249 if (NUM_NONZERO(ctl->limit))
1250 printf(" Message size limit is %d bytes (--limit %d).\n",
1251 ctl->limit, ctl->limit);
1252 else if (outlevel == O_VERBOSE)
1253 printf(" No message size limit (--limit 0).\n");
1254 if (NUM_NONZERO(ctl->fetchlimit))
1255 printf(" Received-message limit is %d (--fetchlimit %d).\n",
1256 ctl->fetchlimit, ctl->fetchlimit);
1257 else if (outlevel == O_VERBOSE)
1258 printf(" No received-message limit (--fetchlimit 0).\n");
1259 if (NUM_NONZERO(ctl->batchlimit))
1260 printf(" SMTP message batch limit is %d.\n", ctl->batchlimit);
1261 else if (outlevel == O_VERBOSE)
1262 printf(" No SMTP message batch limit (--batchlimit 0).\n");
1263 if (ctl->server.protocol == P_IMAP)
1264 if (NUM_NONZERO(ctl->expunge))
1265 printf(" Deletion interval between expunges is %d (--expunge %d).\n", ctl->expunge, ctl->expunge);
1266 else if (outlevel == O_VERBOSE)
1267 printf(" No expunges (--expunge 0).\n");
1269 if (ctl->mda && (ctl->server.protocol != P_ETRN))
1270 printf(" Messages will be delivered with '%s.'\n", visbuf(ctl->mda));
1275 printf(" Messages will be SMTP-forwarded to:");
1276 for (idp = ctl->smtphunt; idp; idp = idp->next)
1278 printf(" %s", idp->id);
1279 if (!idp->val.status.mark)
1280 printf(" (default)");
1283 if (ctl->smtpaddress)
1284 printf(" Host part of MAIL FROM line will be %s\n",
1287 if (ctl->server.protocol != P_ETRN) {
1288 if (ctl->antispam != -1)
1289 printf(" Listener SMTP reponse %d will be treated as a spam block\n",
1291 else if (outlevel == O_VERBOSE)
1292 printf(" Spam-blocking disabled\n");
1294 if (ctl->preconnect)
1295 printf(" Server connection will be brought up with '%s.'\n",
1296 visbuf(ctl->preconnect));
1297 else if (outlevel == O_VERBOSE)
1298 printf(" No pre-connection command.\n");
1299 if (ctl->postconnect)
1300 printf(" Server connection will be taken down with '%s.'\n",
1301 visbuf(ctl->postconnect));
1302 else if (outlevel == O_VERBOSE)
1303 printf(" No post-connection command.\n");
1304 if (ctl->server.protocol != P_ETRN) {
1305 if (!ctl->localnames)
1306 printf(" No localnames declared for this host.\n");
1312 for (idp = ctl->localnames; idp; idp = idp->next)
1315 if (count > 1 || ctl->wildcard)
1316 printf(" Multi-drop mode: ");
1318 printf(" Single-drop mode: ");
1320 printf("%d local name(s) recognized.\n", count);
1321 if (outlevel == O_VERBOSE)
1323 for (idp = ctl->localnames; idp; idp = idp->next)
1325 printf("\t%s -> %s\n", idp->id, idp->val.id2);
1327 printf("\t%s\n", idp->id);
1329 fputs("*\n", stdout);
1332 if (count > 1 || ctl->wildcard)
1334 printf(" DNS lookup for multidrop addresses is %sabled.\n",
1335 ctl->server.dns ? "en" : "dis");
1337 if (ctl->server.envelope == STRING_DISABLED)
1338 printf(" Envelope-address routing is disabled\n");
1341 printf(" Envelope header is assumed to be: %s\n",
1342 ctl->server.envelope ? ctl->server.envelope:"Received");
1343 if (ctl->server.envskip > 1 || outlevel >= O_VERBOSE)
1344 printf(" Number of envelope header to be parsed: %d\n",
1345 ctl->server.envskip);
1346 if (ctl->server.qvirtual)
1347 printf(" Prefix %s will be removed from user id\n",
1348 ctl->server.qvirtual);
1349 else if (outlevel >= O_VERBOSE)
1350 printf(" No prefix stripping\n");
1353 if (ctl->server.akalist)
1357 printf(" Predeclared mailserver aliases:");
1358 for (idp = ctl->server.akalist; idp; idp = idp->next)
1359 printf(" %s", idp->id);
1362 if (ctl->server.localdomains)
1366 printf(" Local domains:");
1367 for (idp = ctl->server.localdomains; idp; idp = idp->next)
1368 printf(" %s", idp->id);
1375 if (ctl->server.interface)
1376 printf(" Connection must be through interface %s.\n", ctl->server.interface);
1377 else if (outlevel == O_VERBOSE)
1378 printf(" No interface requirement specified.\n");
1379 if (ctl->server.monitor)
1380 printf(" Polling loop will monitor %s.\n", ctl->server.monitor);
1381 else if (outlevel == O_VERBOSE)
1382 printf(" No monitor interface specified.\n");
1385 if (ctl->server.protocol > P_POP2 && (ctl->server.protocol != P_ETRN))
1387 printf(" No UIDs saved from this host.\n");
1393 for (idp = ctl->oldsaved; idp; idp = idp->next)
1396 printf(" %d UIDs saved.\n", count);
1397 if (outlevel == O_VERBOSE)
1398 for (idp = ctl->oldsaved; idp; idp = idp->next)
1399 fprintf(stderr, "\t%s\n", idp->id);
1404 /* fetchmail.c ends here */